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Calculate probabilities for two events (and, or, not, conditional), the chance of something happening at least once, and binomial probabilities for k successes in n trials.
Also covers: Odds calculator Β· Binomial probability Β· Independent events
0β1, a percentage (25%), or a fraction (1/4)
0β1, a percentage (25%), or a fraction (1/4)
Leave empty if A and B are independent.
Independent events
Two events A and B, at least once in n tries, or exactly/at most/at least k successes in n trials.
As decimals (0.25), percentages (25%) or fractions (1/4).
Take 1 minus the chance it never happens: with a 1/6 chance per roll, P(at least one six in 4 rolls) = 1 β (5/6)β΄ β 51.8%.
The outcome of one event doesn't change the other's probability β like two coin flips. Then P(A and B) = P(A) Γ P(B).
The chance of exactly k successes in n independent tries, each with the same success probability p: C(n, k) pα΅ (1 β p)βΏβ»α΅.
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